On Thu, Jun 30, 2011 at 09:09:47PM +0200, Felix Paliuc wrote: > Could it be one of these changes made to ch341: > > http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=history;f=drivers/usb/serial/ch341.c;h=6ae1c0688b5e14cb03cb9905ea793ac6caa4f84b;hb=61c4f2c81c61f73549928dfd9f3e8f26aa36a8cf Yes, it could be any of those. Can you run 'git bisect' to try to track down the offender? I looked at your strace output, and didn't see anything obvious other than it looks like the program is timing out a lot. Is it waiting for data to be sent to it from the device? Is there a pointer to the userspace program anywhere that I could look at it to see if it is setting up the line settings properly? Odds are a flow control setting isn't being initialized that is now being paid attention to (older versions of the driver ignored that, which caused overflow problems and that was fixed.) thanks, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
